bugfix: rendering fake screens

Not exercised anywhere except in the shell. I ran into it after running:

  (print screen 34)

Introduced in commit d2f96cb0b6 on Sep 1. This is the sort of thing I
currently don't know how to write tests for :/

103glyph.subx

@@ -66,7 +66,7 @@ draw-code-point-on-screen-array:  # screen-data: (addr array byte), c: code-poin
     8b/-> *(ebp+8) 0/r32/eax
     05/add-to-eax 4/imm32
     #
-    (draw-code-point-on-screen-buffer %eax *(ebp+0xc) *(ebp+0x10) *(ebp+0x14) *(ebp+0x18) *(ebp+0x1c) *(ebp+0x20) *(ebp+0x24))  # => eax
+    (draw-code-point-on-screen-buffer %eax *(ebp+0xc) *(ebp+0x10) *(ebp+0x14) *(ebp+0x18) *(ebp+0x1c) 1 *(ebp+0x20) *(ebp+0x24))  # => eax
 $draw-code-point-on-screen-array:end:
     # . restore registers
     5a/pop-to-edx